It's funny you ran into those values. I have a BMP180 and ran into the very same. It's part of a BerryGPS IMU V3 so I can't just switch out the chip. Bummer =( ➜ BMP180_driver git:(master) ✗ ./barometer Entering Calibration ac1:0x0 ac2:0x3300 ac3:0xc0 ac4:0x54 ac5:0x0 ac6:0x0 b1:0x6002 b2:0x1 mb:0xf ...